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74 Series Dip IC
74HC138 3-to-8 line Decoder/Demultiplexer IC (74138) DIP 16 Package
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74HC138 3-to-8 line Decoder/Demultiplexer IC (74138) DIP 16 Package
The 74HC138 is a high-speed CMOS 3-to-8 line decoder/demultiplexer IC designed for efficient digital logic decoding and data routing applications. It accepts three binary inputs (A0, A1, A2) and activates one of the eight output lines (Y0–Y7) based on the input combination, while all other outputs remain inactive (HIGH).
The IC includes three enable inputs (G1, G2A, G2B) that provide flexible control for cascading or disabling the device. This makes it ideal for use in address decoding, data demultiplexing, and memory selection in microprocessor and microcontroller systems.
Built using advanced CMOS technology, the 74HC138 offers low power consumption, high noise immunity, and fast switching performance, while maintaining compatibility with both TTL and CMOS logic levels. The DIP-16 package ensures easy installation on breadboards or PCBs, making it ideal for students, engineers, and embedded developers alike.
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Features:-
- • Typical propagation delay: 20 ns
- • Wide power supply range: 2V–6V
- • Low quiescent current: 80 µA maximum (74HC Series)
- • Low input current: 1 µA maximum
- • Fanout of 10 LS-TTL loads
Specifications:-
| Parameter | Specification |
| Supply Voltage (VCC | ? 0.5 to + 7.0V DC |
| Input Voltage (VIN) | ?0.5V to VDD + 0.5V |
| Output Voltage (VOUT) | ? 0.5 to VCC + 0.5V |
| Clamp Diode Current (IIK, IOK) | ± 20 mA |
| DC Output Current, per pin (IOUT) | ± 25 mA |
| DC VCC or GND Current, per pin (ICC) | ± 50 mA |
| Storage Temperature Range (TSTG) | ? 65°C to + 150°C |
| Power Dissipation (PD) (Note 4) | 600 mW |
| S.O. Package only | 500 mW |
| Lead Temperature (TL) (Soldering 10 seconds) | 260°C |
Applications:
- Memory address decoding
- Data routing and selection
- Demultiplexing of digital signals
- Microcontroller and microprocessor interfacing
- Programmable logic control systems
- Embedded systems and logic circuit design
* Product image for illustration purposes only, actual product may vary.
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